I live in Suva, when the wind is on like this week it's great. We have all tide conditions, and a huge seawall to kite behind for perfectly flat butter.
The left is pretty good. Not much of a paddle wave but with a kite it can be surfed.
The coral coast generally has more wind but u will find it hard to get a low tide spot as the coral lagoons get exposed.
Sigatoka is a huge open beach with a river mouth that gets decent swell and cranking winds. The only real beachy in Fiji.
Navua was discovered for kiting by My friend and myself many years ago when we lived in Pac Harbour. It's got a faily close outer reef and sand bars close to shore, pretty shallow but safe, can ride all tides. High is good for the reef and low is good for mucking around the sandbars.
A friend of mine part owns Nagigia so i can pass your email to him.